trig identities

Small wonder, since there is nothing to solve. Perhap syou could supply hte entire problem statement and description?

Note: Please don't say you have no idea. These words will antagonize me. You simply MUST have SOME idea. i don't believe there is NOTHING in your past experience that could help.

This might help.
cos(6x) = cos(3x + 3x)
 
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